张博

(教授)

 博士生导师  硕士生导师
学位:博士
性别:男
毕业院校:大连理工大学
所在单位:能源与动力学院
电子邮箱:zhangbo@dlut.edu.cn

论文成果

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Field synergy analysis for turbulent heat transfer on ribs roughened solar air heater

发表时间:2019-03-09 点击次数:

论文名称:Field synergy analysis for turbulent heat transfer on ribs roughened solar air heater
论文类型:期刊论文
发表刊物:RENEWABLE ENERGY
收录刊物:SCIE、EI、Scopus
卷号:83
页面范围:1007-1019
ISSN号:0960-1481
关键字:Turbulent heat transfer; Rib turbulators; Viscous dissipation; Field synergy; Optimization
摘要:Convective turbulent heat transfer field synergy equations for a solar air heater channel with rib turbulators are developed based on the extremum principle of heat transfer potential capacity dissipation. Field synergy equations can be used to increase the field synergy between the velocity vector and temperature gradient fields over the entire heat flow domain to enhance the convective turbulent heat transfer. Solution of the field synergy equations gives the optimal flow field of swirls flow under the ribs and in the cavity area (i.e. between rib to rib), which are followed by a gradual increase of Nusselt number up to following rib, having the best field synergy for a different viscous dissipation. Using optimal velocity patterns as a guide, the design of solid inclined, curved and vertical baffles can be introduced in actual applications, so as to generate the desired swirls flow and enhance the overall coverage of turbulent heat exchange. As illustrative examples, the local field synergy angle analyses for turbulent heat transfer in ribs roughened channel with/without solid baffles are presented. Results show that the solid curved baffles mounted near absorber plate has a best performance evaluation criterion of 0.99. (C) 2015 Elsevier Ltd. All rights reserved.
发表时间:2015-11-01